And to the three who were left behind, until the earth became strait to them notwithstanding its spaciousness and their souls were also straitened to them; and they knew it for certain that there was no refuge from Allah but in Him; then He turned to them (mercifully) that they might turn (to Him); surely Allah is the Oft-returning (to mercy), the Merciful.

M Shakir's Quran Translation

Stress, a result of not abiding by religion

This "dark and narrow" life, or stress, to give it the current name, is the outcome of non-believers' failure to abide by the moral values imparted by faith. Today, doctors maintain that a calm and self-assure composure are essential for protection from the effects of stress. A calm and peaceful disposition is only possible by living according to the Qur'an. This has been discussed under Surah Anaam 6:125 and Surah Raad 13:28.

The wide-ranging research into the connection between religious belief and physical health carried out by Dr. Herbert Benson of the Harvard Medical Faculty has produced surprising conclusions in this area. Despite not being a believer himself, Dr. Benson has concluded that worship and belief in Allah have a more positive effect on human health than that observed in anything else. Benson states that he has concluded that no belief provides as much mental peace as belief in Allah. (Herbert Benson, and Mark Stark, Timeless Healing)